Relationship between coastal water properties and adult return of chum salmon (Oncorhynchus keta) along the Sanriku coast,Japan |
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| Authors: | Taku Wagawa Hiroshi Kuroda Shin‐Ichi Ito Shigeho Kakehi Takeshi Yamanome Takuya Kodama |
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| Institution: | 1. Tohoku National Fisheries Research Institute, Japan Fisheries Research and Education Agency, Shiogama, Miyagi, JapanThese authors contributed equally to this study.;2. Hokkaido National Fisheries Research Institute, Japan Fisheries Research and Education Agency, Kushiro, Hokkaido, Japan;3. Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Chiba, Japan;4. Tohoku National Fisheries Research Institute, Japan Fisheries Research and Education Agency, Shiogama, Miyagi, Japan;5. Iwate Fisheries Technology Center, Kamaishi, Iwate, Japan |
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| Abstract: | We investigated the relationship between adult (age‐4) return rates for chum salmon (Oncorhynchus keta) originating from the Iwate Prefecture, Japan, and coastal environmental conditions during their early ocean life in coastal residency. We analyzed distributions of water properties via intensive hydrographic observations using a conductivity–temperature–depth profiler. Both the return rates and water properties vary strongly over interannual time scales. We found that the time when the return rate decreased drastically corresponded well to the time when the frequency of warm waters in the coastal residency increased. |
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| Keywords: | chum salmon coastal environment hydrographic observation return rate Sanriku coast |
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